For your consideration is this unopened 20 cartridge .45 caliber 500 grain Government Standard smokeless powder center fire cartridges. The trademark on these rounds is U.M.C. which stands for The Union Metallic Cartridge Co. The box lid lists CENTRAL FIRE CARTRIDGES which dates the box to the early 1900's. The condition of this box of cartridges is pristine and unopened as can be seen by the string twined around the bottom of the lid. The measurements of this box of cartridges is 3" x 6" x 1 1/2". The collective weight of this box of cartridges and all 20 rounds is 33.5oz.